I disagree with the cost no more thing. I doubt you would find a tech who would replace the pot for under $10, much less under $60-70. The amp value is about $100-130. So if this amp means that much to a person, then sentimental value may make up the difference for an individual to have a tech do the work. The stuff I use is CRC QD Electronic cleaner, and can be had for less than $10. The amp that had the same exact issue just happen to be a Peavey Silver Stripe Bandit, worth about $150-175. If it requires a bench to fix it, then it would get converted to a cab. https://www.amazon.com/CRC-05103-Electronic-Cleaner-11/dp/B000BXOGNI So to me this is about value and expectations proposition. If the pot is already not operating properly, it certainly doesn't hurt to try to do the cheap fix. I know you were addressing the fact that I said to do this to all of the pots, but if he just did this to the failing pot, and it works for a while, nothing is lost IMO. Cleaning the pot may not work, but it doesn't hurt to try.